My temperature control ****. When all the way to cold it is outside temperature when turned towards heat it goes to full hot. There is no in between. Sometimes when I hit the brakes or a bad bump it goes to full heat. Is it the blend door actuator or the control **** assembly on the dash?

 

Could be either of the two, I would check the actuator since it is the problem most of the time.

 

What year is your truck?

 

2001..

 

I had an issue like that and someone on this forum suggested replacing the nylon gear that operates the blend door. Problem solved.

 

In that case, heater treater may be your solution.

 

https://heatertreater.net/dodge-ram-95-02